Originally Posted by paffie

i've written my own, i find it not so complicated as openX, and pretty fast (i tought openX was great, but there were to many options, and in the end i found it to be a little slow).
It doesn't have a GUI tough (everything has to be entered directly into the DB), but it does measure the amount of shows and clicks, you can set a banner weight, only show banners with a certain keyword, a certain sponsor, a certain height, weight,... You can also disable a banner with one database field.

In case you're interested, you can have it for free if you'd like, but i'm not responsible if it breaks your server ;-)